<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>上传文件</title>
</head>
<body>
    <form action="{{ url_for('upload_submit') }}" method="post" enctype="multipart/form-data">
        <input type="file" name="file">
        <input type="submit" value="上传">
    </form>

</body>
</html>